SELECT 
  * 
FROM 
  cscart_seo_names 
WHERE 
  name = 'post-mounts' 
  AND lang_code = 'en'

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_seo_names",
      "access_type": "ref",
      "possible_keys": ["name", "type"],
      "key": "name",
      "key_length": "758",
      "used_key_parts": ["name", "lang_code"],
      "ref": ["const", "const"],
      "rows": 4,
      "filtered": 100,
      "index_condition": "cscart_seo_names.`name` = 'post-mounts' and cscart_seo_names.lang_code = 'en'"
    }
  }
}

Result